Effect of sub-inhibitory concentrations of antibiotics on biofilm formation and expression of virulence genes in .

Biofilm formation is a key factor in the pathogenesis of enterococcal infections. Thus, the biofilm-forming ability and frequency of biofilm-related genes in (PRASEF) compared to penicillin- and ampicillin-susceptible (PSASEF) were assessed in the present study. In addition, the effect of sub-inhibitory concentrations (sub-MICs) of antibiotics on biofilm formation and expression of virulence genes was evaluated.